RTD测温方案

Circuit Design The circuit shown in Figure 2 converts the RTD resistance change from 100 Ω to 212.05 Ω to an output voltage change of 0.1 V to 2.4 V, which is compatible with the ADC input range. In addition, the circuit removes the errors associated with the wiring resistances r1 and r2. The transfer function of the circuit in Figu re 2 is obtained using the superposition principle: R3 R4 R1 r R1 V R3 R4 R6 R5 R6 r R r R1 ) R1 V V 2 R 2 X1 R OUT ) '( ' 1 ' ' ( ' '              (1 re 2 is obtained using the superposition principle: R3 R4 R1 r R1 V R3 R4 R6 R5 R6 r R r R1 ) R1 V V 2 R 2 X1 R OUT ) '( ' 1 ' ' ( ' '              (1